I'm bored

[Lawman]

I'd want to get to showdown with this, so why bet the river if you're going to fold to a raise. How about check-call?

The way you played it, I'd still call. If he had 77 or 66 he would have raised earlier. If he really is passive then he's woken up with something. Most likely holding is Ax or flush. You're getting 8 to 1 on the call which must be good enough even if you completely discount a bluff.

You could also be creating an image problem if you fold in these spots.